body{
    background:gold;
}
.box{
    width: 500px;
    position: absolute;
    left: 50%;
    top: 50%;
    margin-left: -250px;
    margin-top: -250px;
    text-align: center;
    font-size: 24px;
}
input{
    width: 300px;
    height: 40px;
    border: none;
    outline: none;
    border-radius: 4px;
    margin-top: 20px;
}
button{
    width: 100px;
    height: 40px;
    border-radius: 4px;
    background: skyblue;
    margin: 20px;
    border: none;
}
#reg_btn{
    margin-left: 48px;
}